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This USB power extension cord integrates a manual on-off control switch, drawing 5V power directly from computer USB ports, power banks or wall USB chargers. The exposed 2-pin terminals support easy soldering or crimp connection to LED light strips, low-speed chassis fans, miniature speakers and other 5V low-current devices. The independent switch avoids repeated plugging and unplugging damage to the USB interface, simplifying daily power control. It is a practical DIY wiring accessory for PC case aesthetic upgrades, home small lighting layout and portable small electronic equipment power supply transformation.